/*
 * Copyright 2010-2020 Alfresco Software, Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.activiti.engine.impl.agenda;

import org.activiti.bpmn.model.FlowNode;
import org.activiti.bpmn.model.Process;
import org.activiti.engine.impl.delegate.InactiveActivityBehavior;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.activiti.engine.impl.util.ProcessDefinitionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import java.util.ArrayList;
import java.util.Collection;

/**
 * Operation that usually gets scheduled as last operation of handling a
 * {@link Command}.
 *
 * Executes 'background' behaviours of executions that currently are in an
 * activity that implements the {@link InactiveActivityBehavior} interface.
 *
 */
public class ExecuteInactiveBehaviorsOperation extends AbstractOperation {

	private static final Logger logger = LoggerFactory.getLogger(ExecuteInactiveBehaviorsOperation.class);

	protected Collection<ExecutionEntity> involvedExecutions;

	public ExecuteInactiveBehaviorsOperation(CommandContext commandContext) {
		super(commandContext, null);
		this.involvedExecutions = commandContext.getInvolvedExecutions();
	}

	@Override
	public void run() {

		/*
		 * Algorithm: for each execution that is involved in this command
		 * context,
		 * 
		 * 1) Get its process definition 2) Verify if its process definitions
		 * has any InactiveActivityBehavior behaviours. 3) If so, verify if
		 * there are any executions inactive in those activities 4) Execute the
		 * inactivated behavior
		 */

		for (ExecutionEntity executionEntity : involvedExecutions) {

			Process process = ProcessDefinitionUtil.getProcess(executionEntity.getProcessDefinitionId());
			Collection<String> flowNodeIdsWithInactivatedBehavior = new ArrayList<String>();
			for (FlowNode flowNode : process.findFlowElementsOfType(FlowNode.class)) {
				if (flowNode.getBehavior() instanceof InactiveActivityBehavior) {
					flowNodeIdsWithInactivatedBehavior.add(flowNode.getId());
				}
			}

			if (flowNodeIdsWithInactivatedBehavior.size() > 0) {
				Collection<ExecutionEntity> inactiveExecutions = commandContext
						.getExecutionEntityManager()
						.findInactiveExecutionsByProcessInstanceId(
								executionEntity.getProcessInstanceId());
				for (ExecutionEntity inactiveExecution : inactiveExecutions) {
					if (!inactiveExecution.isActive()
							&& flowNodeIdsWithInactivatedBehavior
									.contains(inactiveExecution.getActivityId())
							&& !inactiveExecution.isDeleted()) {

						FlowNode flowNode = (FlowNode) process.getFlowElement(
								inactiveExecution.getActivityId(), true);
						InactiveActivityBehavior inactiveActivityBehavior = ((InactiveActivityBehavior) flowNode
								.getBehavior());
						logger.debug(
								"Found InactiveActivityBehavior instance of class {} that can be executed on activity '{}'",
								inactiveActivityBehavior.getClass(),
								flowNode.getId());
						inactiveActivityBehavior
								.executeInactive(inactiveExecution);
					}
				}
			}

		}
	}

}
